Can I aim two (2) LV5 Emitters at the same LV5 Sensor?

Yes and no, depending on what you are trying to achieve. If you want only one of the laser beams detect an object and trigger a signal then this may not work because the Sensor may not register a break of laser signal since the laser from the other Emitter is still being received. On the other hand if you want the break of laser on both Emitter lasers to trigger a signal then the setup would work.